To be sure, those interchanges are the most pleasant to drive through, but at a cost of land. The interchange design presented in the NPR article is much more feasible in urban centers where you might be constrained by existing structures. The accel/decel ramps can run parallel to the freeway, leading to nearly-right angle turns at street level. (It's not drawn this way in the article, but it doesn't take much imagination to picture it.)